Journal article
Visualizing Vortex Dynamics in Py/Nb Thin Film Hybrids by Low Temperature Magnetic Force Microscopy
Journal of superconductivity and novel magnetism, v 25(7), pp 2167-2171
01 Oct 2012
Abstract
We have analyzed the vortex dynamics in Py(1 mu m)/SiO2(10 nm)/Nb(360 nm) thin film heterostructures as resulted from Magnetic Force Microscopy (MFM) frequency shift maps at low temperatures. The Nb film thickness has been chosen larger than the superconducting London penetration depth of about lambda (L)=68 nm at the measuring temperatures. Above the Nb T (c), the stripe-like Py stray field is visualized with half-period w (Py)=520 nm. Below the Nb T (c), we have found that in a zero applied field, the supercurrents established in the Nb layer completely screen the out-of-plane component of the Py stray field. However, when the samples are cooled in a uniform external magnetic field, vortices are formed in chain-like configurations along the stripes with the same polarity. By decreasing and reversing the applied field, for low intensities, we have found a rigidity of the vortex array that remains "frozen" in the configuration as determined after the first field cooling run. The observed symmetry is then broken for higher values of the applied field, when an antivortex "avalanche" enters the Ferromagnetic/Superconducting (FM/SC) system.
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Details
- Title
- Visualizing Vortex Dynamics in Py/Nb Thin Film Hybrids by Low Temperature Magnetic Force Microscopy
- Creators
- A. M. Cucolo - University of SalernoA. Scarfato - University of SalernoM. Iavarone - Temple UniversityM. Longobardi - Italian Institute of TechnologyF. Bobba - University of SalernoG. Karapetrov - Argonne National LaboratoryV. Novosad - Argonne National LaboratoryV. Yefremenko - Argonne National Laboratory
- Publication Details
- Journal of superconductivity and novel magnetism, v 25(7), pp 2167-2171
- Publisher
- Springer Nature
- Number of pages
- 5
- Grant note
- DE-AC02-06CH11357 / US Department of Energy Office of Science laboratory; United States Department of Energy (DOE) MIUR (Italian Ministry for Higher Education and Research) under the project "Rientro dei Cervelli"; Ministry of Education, Universities and Research (MIUR) DE-SC0004556 / US Department of Energy; United States Department of Energy (DOE) UChicago Argonne, LLC
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000309157200015
- Scopus ID
- 2-s2.0-84870255189
- Other Identifier
- 991019295298504721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Physics, Applied
- Physics, Condensed Matter